buffer: make touch_buffer() an exported function
We want to add a trace point to touch_buffer() but macros and inline
functions defined in header files can't have tracing points. Move
touch_buffer() to fs/buffer.c and make it a proper function.
The new exported function is also declared inline. As most uses of
touch_buffer() are inside buffer.c with nilfs2 as the only other user,
the effect of this change should be negligible.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/fs/buffer.c b/fs/buffer.c
index c017a2d..a8c2dfb 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -53,6 +53,12 @@
}
EXPORT_SYMBOL(init_buffer);
+inline void touch_buffer(struct buffer_head *bh)
+{
+ mark_page_accessed(bh->b_page);
+}
+EXPORT_SYMBOL(touch_buffer);
+
static int sleep_on_buffer(void *word)
{
io_schedule();